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fadab094 NP |
1 | /* |
2 | * linux/arch/arm/lib/copy_from_user.S | |
3 | * | |
4 | * Author: Nicolas Pitre | |
5 | * Created: Sep 29, 2005 | |
6 | * Copyright: MontaVista Software, Inc. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/linkage.h> | |
14 | #include <asm/assembler.h> | |
15 | ||
16 | /* | |
17 | * Prototype: | |
18 | * | |
02fcb974 | 19 | * size_t __copy_from_user(void *to, const void *from, size_t n) |
fadab094 NP |
20 | * |
21 | * Purpose: | |
22 | * | |
23 | * copy a block to kernel memory from user memory | |
24 | * | |
25 | * Params: | |
26 | * | |
27 | * to = kernel memory | |
28 | * from = user memory | |
29 | * n = number of bytes to copy | |
30 | * | |
31 | * Return value: | |
32 | * | |
33 | * Number of bytes NOT copied. | |
34 | */ | |
35 | ||
36 | .macro ldr1w ptr reg abort | |
37 | 100: ldrt \reg, [\ptr], #4 | |
38 | .section __ex_table, "a" | |
39 | .long 100b, \abort | |
40 | .previous | |
41 | .endm | |
42 | ||
43 | .macro ldr4w ptr reg1 reg2 reg3 reg4 abort | |
44 | ldr1w \ptr, \reg1, \abort | |
45 | ldr1w \ptr, \reg2, \abort | |
46 | ldr1w \ptr, \reg3, \abort | |
47 | ldr1w \ptr, \reg4, \abort | |
48 | .endm | |
49 | ||
50 | .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort | |
51 | ldr4w \ptr, \reg1, \reg2, \reg3, \reg4, \abort | |
52 | ldr4w \ptr, \reg5, \reg6, \reg7, \reg8, \abort | |
53 | .endm | |
54 | ||
55 | .macro ldr1b ptr reg cond=al abort | |
56 | 100: ldr\cond\()bt \reg, [\ptr], #1 | |
57 | .section __ex_table, "a" | |
58 | .long 100b, \abort | |
59 | .previous | |
60 | .endm | |
61 | ||
62 | .macro str1w ptr reg abort | |
63 | str \reg, [\ptr], #4 | |
64 | .endm | |
65 | ||
66 | .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort | |
67 | stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8} | |
68 | .endm | |
69 | ||
70 | .macro str1b ptr reg cond=al abort | |
71 | str\cond\()b \reg, [\ptr], #1 | |
72 | .endm | |
73 | ||
74 | .macro enter reg1 reg2 | |
75 | mov r3, #0 | |
76 | stmdb sp!, {r0, r2, r3, \reg1, \reg2} | |
77 | .endm | |
78 | ||
79 | .macro exit reg1 reg2 | |
80 | add sp, sp, #8 | |
81 | ldmfd sp!, {r0, \reg1, \reg2} | |
82 | .endm | |
83 | ||
84 | .text | |
85 | ||
02fcb974 | 86 | ENTRY(__copy_from_user) |
fadab094 NP |
87 | |
88 | #include "copy_template.S" | |
89 | ||
90 | .section .fixup,"ax" | |
91 | .align 0 | |
92 | copy_abort_preamble | |
93 | ldmfd sp!, {r1, r2} | |
94 | sub r3, r0, r1 | |
95 | rsb r1, r3, r2 | |
96 | str r1, [sp] | |
97 | bl __memzero | |
98 | ldr r0, [sp], #4 | |
99 | copy_abort_end | |
100 | .previous | |
101 |